Abstract
In this study, we report our approach to manipulate the strength of perpendicular magnetic anisotropy (PMA) at oxide/ferromagnetic metal of Heusler alloy (HA) interface by tuning the parameter of annealing temperature. Robust PMA energy density (Keff) of $\sim $ 0.43 $\times $ 106 erg/cm3 and small saturation magnetization (Ms) as low as $\sim $ 248 emu/cm3 have been achieved for MgO/Co2FeAl (CFA)/Mo stacks at 400 $^{\circ }$ C. We identify that PMA energy is thermally stable up to the maximum temperature of 400 $^{\circ }$ C. Effect of annealing temperature on surface morphology, grain distribution, and surface roughness of the stacks are investigated by atomic force microscopy (AFM). Further, X-ray photoelectron spectroscopy (XPS) study demonstrates that the interfacial oxidation decides the strong PMA property at MgO/Co2FeAl interface during the annealing process. This MgO/CFA/Mo trilayer system can be a suitable candidate for the development of low-power consumption, huge-density data storage, high-thermal stability against the annealing temperature, and nonvolatile magnetic memories.
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